<?php
session_start()
$id = $_GET['id'];
$name= $_GET['name'];
$price=$_GET['price'];
$upd= $_GET['upd'];
if($upd == "add"){
	if (empty($_SESSION['cart'])){
		$order=array();
		$order_item=array('id'=> $id,'name'=>$name,'price'=> $price ,'num'=>1);
		array_push($order,$order_item);
		$_SESSION['cart']=$order;
	}else{
		$order=$_SESSION['cart'];
		if(in_array($id,array_column($order,'id'))){
			$key=array_search($id,array_column($order,'id'));
			$order[$key]['num']+=1;
		}else{
			$order_item=array('id'=>$id,'name'=>$name,'price'=> $price ,'num'=>1);
			array_push($order,$order_item);
		}
		$_SESSION['cart']=$order;
	}
	header('Location:index.php');
}
if($upd=="cart"){
	if(!empty($_SESSION['cart'])){
		header('Location:cart.php');
	}else{
		header('Location:index.php');
	}
}